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The Effect of Heat and Chemical Sterilization on the Rubber Parts of Milking Machines

University of California, College of Agriculture, Davis, California

ABSTRACT

The literature does not cover completely the effect of heat and of the common chemical sterilizing agents on the life (period of usefulness) of the rubber parts of milking machines.⁴ In some milk control areas, the law requires heat sterilization of all dairy equipment, including the rubber parts of milking machines. Because such requirements exist and because there is little information concerning the effect of both heat and chemical sterilization on the life of the rubbers, a detailed study of this subject was included in an investigation of the sanitary operation of milking machines.⁵ The data reported are based on the operation of four units of a milking machine of one manufacturer⁶ which were used for a period of two years in milking the Experiment Station herd.

Determination of the Life of the Rubbers

The life of milking machine rubbers depends on several factors, such as quality and age, thoroughness of cleaning, and method of sterilization.

¹ Associate in the Experiment Station.

² Professor of Dairy Industry and Dairy Technologist in the Experiment Station.

³ Supervisor of Official Advanced Registry Tests in the Division of Animal Husbandry.

⁴ Burgwald, L. H. Cleaning milking machines. U. S. Department of Agriculture Farmers' Bul. 1315. 1923.

⁵ Henderson, J. L., Roadhouse, C. L., and Folger, A. The sanitary care, operation and installation of milking machines. California Agr. Ext. Serv. Circ. 69. November, 1932.

⁶ The De Laval machine was used in these experiments. It is recognized that there is a variation in the effect of heat upon the life of rubber parts for milking machines.